Nimrod from Enigma Variations

If I had an organ with 100+ stops and half a dozen of stop pullers, then this pieces would be relatively easy. I tried to do it alone, using only 4 combinations --- this is what you have in "real life".
Not yet well practised, this is a case study if it is at least possible to play, say, next sunday in the service, on a "real" mechanical tracker organ. So please comment: does it "fly"?